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Gravitational Waves
We've now detected hundreds of gravitational waves with LIGO, Virgo, and KAGRA. What if we tried Weber's original method in the modern day?
We've long known we can't go back to infinite temperatures and densities. But the hottest part of the hot Big Bang remains a cosmic mystery.
All of the matter that we measure today originated in the hot Big Bang. But even before that, and far into the future, it'll never be empty.
The universe is filled with unlikely events, but it is also full of ways to fool ourselves.
10 years ago, LIGO first began directly detecting gravitational waves. Now better than ever, it's revealing previously unreachable features.
It's the origin of our entire observable Universe, but it's still not the very beginning of everything.
Two supermassive black holes on an inevitable death spiral push the limits of Einstein's relativity. New observations reveal even more.
The Big Bang was hot, dense, uniform, and filled with matter and energy. Before that? There was nothing. Here's how that's possible.
Whether you run the clock forward or backward, most of us expect the laws of physics to be the same. A 2012 experiment showed otherwise.
With over 300 high-significance gravitational wave detections, we now have a huge unsolved puzzle. Will we invest in finding the solution?
A few physical quantities, in all laboratory experiments, are always conserved: including energy. But for the entire Universe? Not so much.